New materials such as gilded cobber and silvery threads emerged.

例如，镀线程出现的新材料。

Process of surface treatments include gold plating, silver plating ,nickel plating, chrome plating, tin plating, zinc plating, electrostatic painting, cataphoretic coating, aluminium oxidizing, etc.

品的表面处理（镀．．．．锡．锌．静电喷涂．喷漆等）。